Ratios of charged antiparticles to particles near mid-rapidity in Au+Au collisions at sqrt(s_NN) = 200 GeV

Abstract

The ratios of charged antiparticles to particles have been obtained for pions, kaons and protons near midrapidity in central Au+Au collisions at sqrt(s_NN) = 200 GeV. Ratios of <pi->/<pi+> = 1.025 +/- 0.006 (stat.) +/- 0.018 (syst.), <K->/<K+> = 0.95 +/- 0.03 (stat.) +/- 0.03 (syst.) and <pbar>/<p> = 0.73 +/- 0.02 (stat.) +/- 0.03 (syst.) have been observed. The <K->/<K+> and <pbar>/<p> ratios are consistent with a baryochemical potential mu_B of 27 MeV, roughly a factor of 2 smaller than in sqrt(s_NN) = 130 GeV collisions. The data are compared to results from lower energies and model calculations. Our accurate measurements of the particle ratios impose stringent constraints on current and future models dealing with baryon production and transport.

arXiv comment5 pages, 4 figures

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• Charged hadron transverse momentum distributions in Au+Au collisions at sqrt(s_NN) = 200 GeV
• Statistical Model Predictions for Particle Ratios at sqrt(s_NN) = 5.5 TeV
• Deuteron and antideuteron production in Au+Au collisions at sqrt(s_NN)=200 GeV
• Baryon Number Violation and String Topologies
• Medium induced jet absorption at relativistic heavy ion collisions
• Baryon Junction Loops in HIJING/BBv2.0 and the Baryon/Meson Anomaly at RHIC
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• Charged antiparticle to particle ratios near midrapidity in p+p collisions at sqrt(s_NN)=200 GeV
• Dilepton production in p+p, Cu+Cu and Au+Au collisions at 200 AGeV
• Thermodynamic limit and semi--intensive quantities
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• Lessons from PHOBOS
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